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Total record count: 6269.

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	Eng ID	Term	Definition
	5401	territorial waters	See TERRITORIAL SEA.
	5402	tesla	The unit of magnetic flux density in the SI SYSTEM.
	5403	test	The hard covering or supporting structure of many invertebrates; it may be enclosed within an outer layer of living tissue; a SHELL.
	5404	Texas tower	A fixed tower mounted on the CONTINENTAL SHELF or on a SHOAL, used to drill and operate gas or petroleum wells, and to provide a platform fo... more A fixed tower mounted on the CONTINENTAL SHELF or on a SHOAL, used to drill and operate gas or petroleum wells, and to provide a platform for AIDS TO NAVIGATION and meteorological or oceanographic instrumentation.
	5405	thalweg	See TALWEG.
	5406	thaw	Melting of SNOW and/or ICE, at the EARTH's surface, following a temperature rise above 0°C.
	5407	thematic map	See MAP.
	5408	theodolite	A precision surveying instrument consisting of an ALIDADE with a TELESCOPE. It is mounted on an accurately graduated CIRCLE and is equipped... more A precision surveying instrument consisting of an ALIDADE with a TELESCOPE. It is mounted on an accurately graduated CIRCLE and is equipped with necessary LEVELS and reading devices. Sometimes, the ALIDADE carries a graduated VERTICAL CIRCLE.
	5409	theodolite: direction	A THEODOLITE in which the graduated HORIZONTAL CIRCLE remains fixed during a series of OBSERVATIONS, the TELESCOPE being pointed on a numb... more A THEODOLITE in which the graduated HORIZONTAL CIRCLE remains fixed during a series of OBSERVATIONS, the TELESCOPE being pointed on a number of SIGNALS or objects in succession, and the DIRECTION of each read on the CIRCLE, usually by the use of MICROMETER MICROSCOPES.
	5410	theodolite: face(s) of	See FACE(S) OF THEODOLITE.
	5411	theodolite: repeating	A THEODOLITE so designed that successive measures of an angle may be accumulated on the graduated CIRCLE, and a final reading of the CIRCLE ... more A THEODOLITE so designed that successive measures of an angle may be accumulated on the graduated CIRCLE, and a final reading of the CIRCLE made which represents the sum of the repetitions. The observed value of the angle is obtained by dividing the total arc passed through in making the series of OBSERVATIONS by the number of times the angle has been observed. Also called repeating instrument. See REPETITION METHOD OF OBSERVATION.
	5412	theodolite: transit	See TRANSIT.
	5413	theodolite axes	See AXIS: HORIZONTAL and AXIS: VERTICAL.
	5414	theodolite drag	See DRAG (of THEODOLITE).
	5415	theoretical error	See ERROR.
	5416	thermal equator	See EQUATOR.
	5417	thermal layer	See THERMOCLINE.
	5418	thermocline	A vertical negative temperature gradient in some LAYER of a body of water, which is appreciably greater than the GRADIENTS above and below i... more A vertical negative temperature gradient in some LAYER of a body of water, which is appreciably greater than the GRADIENTS above and below it; also a LAYER, in which such a GRADIENT occurs. The principal thermoclines in the OCEAN are either seasonal, due to heating of the surface water in summer, or permanent. Also called discontinuity layer, or thermal layer.
	5419	thermocline: transient	A small decrease in vertical temperature observed above the THERMOCLINE. It is a short-term PHENOMENON associated primarily with diurnal he... more A small decrease in vertical temperature observed above the THERMOCLINE. It is a short-term PHENOMENON associated primarily with diurnal heating and wind mixing.
	5420	thermogram	Record made by a THERMOGRAPH.
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